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Products HomeGoniometer Stages
- Pure Rotational Motion About a Fixed Point Above the Stage
- 1° Graduation Marking on Side
- Accuracy of 10 arcmin
GN1
GNL10
GN05
GNL18
GNL20
GN2
Virtual Rotation Points
of Stacked Stages Align
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Features
- Pure Rotational Motion About a Virtual Point
- 1° Graduation Marks on Side
- Backlash-Free Spring-Loaded Design
- Fully Lockable
- Small Platform Goniometer Stage: 1" x 1"
- Large Platform Goniometer Stage: 1.5" x 1.5"
(Available Motorized)
A goniometer or goniometric stage is a device used to rotate an object precisely, within a small angular range, about a fixed point in space. Goniometers are similar to linear stages, but, rather than providing linear movement, the stage partially rotates about a fixed point above the mounting surface of the stage. In our two product lines, the distance from the point of rotation to the mounting surface was designed so that two different goniometer models may be stacked in an XY configuration and both stages will rotate about the same point. Our goniometers use a backlash-free leadscrew in the smaller GN series and a precision micrometer for enhanced angular positioning of the top plate in the larger GNL series.
Our goniometers offer unobstructed, pure rotational motion about their point of rotation over the angle of rotation (see image to the right). The compact, stackable design allows one model to be fastened to the top plate of another aligning their points of rotation. In the GN series, the GN05(/M) mounts atop the GN1(/M). In the GNL series, the GNL10(/M) mounts atop the GNL18(/M). These two axis stage setups can be purchased as a single package [GN2(/M) or GNL20(/M) respectively].
The precision dovetail design, accompanied by a backlash-free lead screw and a vernier scale, provides accurate and repeatable positioning. A side mounted setscrew can be used to lock the platform in position.
The GN series goniometers provide an array of four 2-56, four 4-40 (M2.5 x 0.45), and eight 6-32 (M3 x 0.5) taps for mounting. This series can be either post mounted via an 8-32 (M4) tap or mounted to a mini series breadboard via the slotted mounting holes.
Alternatively, the GNL series offers twelve 4-40 (M2.5 x 0.45) and sixteen 6-32 (M4 x 0.7) taps. See below or the Specs tab for mounting hole position. Our PM3(/M) and PM4(/M) clamping arms feature 6-32 (M4) threads, allowing them to be attached to most goniometers.
Single-Axis Goniometers
| Item # | GN05(/M) | GN1(/M) | GNL10(/M) | GNL18(/M) |
|---|---|---|---|---|
| Distance to Point of Rotation from Top Surface | 0.50" (12.7 mm) | 1.00" (25.4 mm) | 1.00" (25.4 mm) | 1.75" (44.5 mm) |
| Rotation | ±15o | ±10o | ±10o | ±5o |
| Accuracy | 10 arcmin (0.167°) | |||
| Load Capacity | 0.25 lbs (0.113 kg) | 1.0 lb (0.45 kg) | ||
| Goniometer Dimensions (W x D x H) | 1.00" x 1.00" x 0.50" (25.4 mm x 25.4 mm x 12.7 mm) | 1.50" x 1.50" x 0.75" (38.1 mm x 38.1 mm x 19.1 mm) | ||
| Base Plate Dimensions (W x D x H) | 1.00" x 1.85" x 0.20" (25.4 mm x 47.0 mm x 5.1 mm) | Imperial Goniometers: 1.50" x 2.50" x 0.20" | ||
| Metric Goniometers: 38.1 mm x 62.7 mm x 5.1 mm | ||||
| Body Material | Anodized Aluminum | |||
Dual-Axis Goniometers
| Item # | GN2(/M) | GNL20(/M) |
|---|---|---|
| Distance to Point of Rotation from Top Surface | 0.50" (12.7 mm) | 1.00" (25.4 mm) |
| Rotation | ±10o / ±15o | ±5o / ±10o |
| Accuracy | 10 arcmin (0.167°) | 10 arcmin (0.167°) |
| Load Capacity | 0.25 lbs (0.113 kg) | 1.0 lb (0.45 kg) |
| Goniometer Dimensions | 1.00" x 1.00" x 1.00" (25.4 mm x 25.4 mm x 25.4 mm) | 1.50" x 1.50" x 1.50" (38.1 mm x 38.1 mm x 38.1 mm) |
| Base Plate Dimensions | 1.00" x 1.85" x 0.20" (25.4 mm x 47.0 mm x 5.1 mm) | GNL20: 1.50" x 2.50" x 0.20" GNL20/M: 38.1 mm x 62.7 mm x 5.1 mm |
| Body Material | Anodized Aluminum | |
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GNL Series Mounting Options
Click for Details
GN Series Mounting Options
Smart Pack
- Minimize CO2 Footprint
- Reduce Non-Recyclable Packing Materials
- Improve Packaging Integrity
- Saves on Shipping Costs
Thorlabs' Green Initiative is aimed at reducing waste. To that end, we have begun to re-engineer our product packaging. The GL10 and GL18 are now shipped in re-engineered packaging that minimizes the use of non-recyclable materials.
Over the course of a year, the re-engineered packaging across our product line is projected to reduce our CO2 footprint by more than 16,184 kg and reduce packaging by over 13,893 pounds! As we move through our product line, we will label re-engineered packages with our green Smart Pack sticker (above).
| Posted Comments: | |
yichen_chuang
(posted 2016-02-17 23:11:07.903) Hi, a bead and the lock screw went off when I tried to mount the GN1 to a post. Now the goniometer only rotates one way but the other direction we have to manually "push" it to rotate.
Is there anyway we can fix it? (the bead was missing unfortunately...)
thanks! besembeson
(posted 2016-03-03 02:23:48.0) Response from Bweh at Thorlabs USA: I will contact you to send this for repair. j.fischer
(posted 2015-12-30 12:04:43.757) Hi,
I would like to use a GN05/M or GN2/M upside down, meaning that I would like to attach my load where the base-plate is right now and I would mount the GN2/M where now the load is supposed to be (likely using a custom baseplate).
Is the baseplate removable? Can it be attached to the top surface, or is there another easy way to mount the top surface to another large surface (with custom bores and threads)? besembeson
(posted 2016-01-04 02:11:11.0) Response from Bweh at Thorlabs USA: Thanks for contacting Thorlabs. You can use this in the upside down configuration, with reduced load capacity. The base plate is connected to the mounting plate through four cap screws so it can be removed. The mounting plate only has threaded holes (around the central mounting area) so attaching this to the top plate (that also has threaded holes) is not recommended. I will contact you if a special adapter plate is needed. mark.preddy
(posted 2014-07-31 17:04:38.28) I'm considering this goniometer for a vacuum application but am concerned about the lubrication of the dovetails. The device appears to be anodized aluminum, if this is the case, would lubrication be necessary? If they are not aluminum, out of curiosity, what are they made of? cdaly
(posted 2014-08-07 10:25:09.0) Response from Chris at Thorlabs: Thank you for your inquiry. The main body of the goniometer is made form anodized aluminum. The stage uses apiezon grease, which is vacuum compatible, but the micrometer does not. We may be able to provide one as a custom vacuum version without the micrometer, but due to the tight tolerances on these parts, we would not be able to strip the anodization and would need to make them from scratch. alrun.thuemen
(posted 2014-05-07 12:05:12.29) We use this Gonoimeter 6 times in our jig. And in some positions the restoring force is not strong enough. Is it possible to change the spring? If yes, do you have alternatives?
Do you have think about caps in different colors for the srews. I think it could be very helpful for making instructions how to use jigs.
Thx, Thümen cdaly
(posted 2014-05-08 04:27:33.0) Response from Chris at Thorlabs: Thank you for your inquiry. There may be a possibility of replacing the spring in a custom version to increase the restoring force, but we would likely not be able to provide this at lower quantities. I will contact you directly to discuss this further with you. We would not be able to provide customer color coded actuator screws for the goniometers however. mgez
(posted 2014-01-13 09:39:52.97) Hi,
We need to replace the goniometer spring in GNL 10/M and 18/M - Does it have a part no we can order ? where we can find/buy it?
Thx,
Motti Gez
Lumio jlow
(posted 2014-01-15 08:25:00.0) Response from Jeremy at Thorlabs: We will contact you for a quote on the springs. cbrideau
(posted 2013-06-24 21:06:17.773) Can you please tell me how much the GN2 goniometer weighs? pbui
(posted 2013-06-27 11:03:00.0) Response from Phong at Thorlabs: The GN2 weighs 0.10 pounds. user
(posted 2013-05-17 08:31:20.473) Could you please suggest a method of affixing one of these goniometers to th RP01/M rotation stage? cdaly
(posted 2013-05-21 13:19:00.0) Response from Chris at Thorlabs: Thank you for using our web feedback. There's really no direct way to mount the two together. You could use a plate such as C1520/M which will attach to the top of the stage with an M6 threaded stud to give you a good mounting surface for the goniometer, but this is probably going to block the reference marking. Would it be possible to use the PR01/M instead? This has a large enough surface with appropriate mounting holes that the goniometer can be mounted directly to. We also have the TTR001 stage available with tip/tilt/rotation adjustment, though it would not have the full 360 degree range of the RP01. tcohen
(posted 2012-09-13 13:14:00.0) Response from Tim at Thorlabs: The main scale has 1 degree graduations and the Vernier scale increments in 10 arcmin graduations as you noted. If the central line on the Vernier is aligned with a degree mark on the moving platform, this is read in degrees. The line on the Vernier scale that is aligned with one on the rotation dial is the value read in 10 arcmins to give a finer scale to read between the main degree graduations. I will contact you to discuss this and your calculation further. huub.de.graaf
(posted 2012-09-13 09:53:49.0) I am also struggling with the use of the goniometers. I assumed 1 line (marker) on the goniometer is equivalent to 10 arcmin. This however would mean that 6 full rotations of the goniometer creates a tilt of 25 deg (25*6*10= 1500 arcmin = 25 deg). Somehow I think this is not correct. Please give the correct scale factor. jjurado
(posted 2011-08-09 18:36:00.0) Response from Javier at Thorlabs to tech: Thank you very much for your feedback. We will considering adding documentation with instructions on the use of the Vernier scale engraved on our goniometers to the website or to the final product. In the meantime, I will contact you with this information. tech
(posted 2011-08-09 16:03:16.0) Why dont you offer any instructions on how to use your goniometers? Specifically,instructions on how touse the vernier scales to obtain the stated accuracy?
Just because I bought one of your stages doesnt mean I know how to use it. I assumed instructions would come with the device, but no. Obviously you guys are much more interested in selling your products than you are in making sure your customers know how to use the products. bdada
(posted 2011-04-13 15:47:00.0) Response from Buki at Thorlabs to Harald:
The maximum load is limited by the pulling force of the springs inside. Therefore, it should be the same even when it is mounted upside down.
If you have further questions, please email TechSupport@thorlabs.com harald.hovland
(posted 2011-04-13 17:09:56.0) I am interested in a product to mount a camera vertically and adjust it with reasonably good precision. The GNL20/M might be an option if i can mount the goniometer upside-down and hang the camera under the goniometer. The question is if the goniometer can be mounted this way and support this (negative) load. The camera with lens weights approx. 350 gram, and i could probably manage to produce an extra bracket weighing less than 100 g to be within the 1 lb stated. I assume the weight limit is stated for nominal (not upside-down) operation, though? Greg
(posted 2011-01-13 08:22:38.0) A response from Greg at Thorlabs to johannes.trapp: In order to change the adjuster, a bushing is needed with the same dimensions as the stock bushing. Unfortunately, we do not have any other bushings that will fit the GN2/M without a redesign of the product. We will contact you to discuss this further. johannes.trapp
(posted 2010-12-21 09:00:01.0) Hallo,
is there a possibility to change the screws for the GN2/M in order to achieve a higher precision?
If so, which screws are compatible?
thanks Thorlabs
(posted 2010-06-28 13:29:27.0) Response from Javier at Thorlabs to david.thompson: we offer thread adapters that may work for mounting different optics or other components onto the GNL10. For example, if you are looking to mount a prism, you can use our our PM1 and PM2 clamping arms, which have #6-32 threads. We could also discuss the design of a custom plate, although the use of such a plate would shorten the distance to the point of rotation of the stage. I will contact you directly to discuss your application a bit further. david.thompson
(posted 2010-06-27 17:33:08.0) I just bought two of these. I didnt look carefully enough at the mounting holes. My lab is basically standardized on 1/4-20. So most of my mounts will not interface easily with these goniometers. Can you recommend an adapter plate? It would be great if that were listed as a possible accessory on this page. ghegenbart
(posted 2008-06-26 09:27:59.0) The GNxx/M series products have M3 mounting holes. Please add information on the pitch to the drawings. Both M3-0.20 and M3-0.25 are common, so it may happen that a user has M3 screws that dont fit and he is wondering why. bob
(posted 2008-01-21 10:34:53.0) Dear Sir,
This appears to be some thing that We are looking for.
May I request you to send us a little more detailed Brochure, for Prism measurements.
a. Please confirm whether it is possible to have a digital readout hooked to the above Angles measurement of Prism .
b. Will it be possible to have a computer Interface with the said instrument. Please reply even if the accesories are to be procured from else where since we are looking for a total set up with a digital readout and computer interface. In case This instrument is compatible for the accessories mentioned above then perhaps that is what we are looking for. You may suggest also about the vendors who could supply the digital readouts and computer interface suitable and compatinle to your instrument. We are trying to measure the refractive Angles and not mearly reflective angles whcih may please be noted.
We shall be obliged for an early reply.
Best regards.
BOB |
Click to Enlarge
Small Platform Goniometer Dimensions
Click for Details
Mounting Options
| Item # | GN05(/M) | GN1(/M) | GN2(/M) |
|---|---|---|---|
| Distance to Point Rotation from Top Surface | 0.50" (12.7 mm) | 1.00" (25.4 mm) | 0.50" (12.7 mm) |
| Rotation | ±15o | ±10o | ±10o / ±15o |
| Accuracy | 10 arcmin (0.167°) | ||
| Load Capacity | 0.25 lbs (0.113 kg) | ||
| Goniometer Dimensions (W x D x H) | 1.00" x 1.00" x 0.50" (25.4 mm x 25.4 mm x 12.7 mm) |
1.00" x 1.00" x 1.00" (25.4 mm x 25.4 mm x 25.4 mm) |
|
| Base Plate Dimensions (W x D x H) | 1.00" x 1.85" x 0.20" (25.4 mm x 47.0 mm x 5.1 mm) |
||
Click to Enlarge
Large Platform Goniometer Dimensions
Click for Details
Mounting Options
| Item # | GNL10(/M) | GNL18(/M) | GNL20(/M) |
|---|---|---|---|
| Distance to Point of Rotation from Top Surface | 1.00" (25.4 mm) | 1.75" (44.5 mm) | 1.00" (25.4 mm) |
| Rotation | ±10o | ±5o | ±5o / ±10o |
| Accuracy | 10 arcmin (0.167°) | ||
| Load Capacity | 1.0 lb (0.45 kg) | ||
| Goniometer Dimensions (W x D x H) | 1.50" x 1.50" x 0.75" (38.1 mm x 38.1 mm x 19.1 mm) |
1.50" x 1.50" x 1.50" (38.1 mm x 38.1 mm x 38.1 mm) |
|
| Base Plate Dimensions (W x D x H) | Imperial Goniometers: 1.50" x 2.50" x 0.20" | ||
| Metric Goniometers: 38.1 mm x 62.7 mm x 5.1 mm | |||
Additional Manual Stages
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